When the wire is made, it needs a layer of foil inside, and the outside is insulated. Why is that?
Shield used as a cable. The cable foil requires less oil on the surface and has no holes. It has high mechanical properties, but the overall quality requirements are not high, but the requirements of the length are very strict.
Insulation is done outside to protect or leak electricity.Cable foil is the use of aluminum foil sealing and shielding, single or double coated plastic film, an aluminum foil plastic composite #
Wire, usually used as a signal wire, is used as a shield to reduce interference from external signals to the transmitted signal;
